Heddle frame for looms



April 6 1954 A. BLICKENsToRl-ER 2674275 HEDDLE FRAME FOR Looms Filed Dec. 16, 1949 E WWW? Patented Apr. 6, 1954 HEDDLE FRAME FOR LOOMS Albert Blicken'storfer, Horgen, Switzerland, assignor to E; Froehlich A. G., Horgen, Switzerland, a. corporation of Switzerland ApplicationDecembc-.r 16,1949, SerialNo..133,i43v

Glaimspriority, application .Switzerlandv May 6, 1949` 1- Claim. l Y

This invention refers t'ov improvements in heddle frame structures. Heddle frames for looms have often frame bars forming hollow staves preferably of light metal, for the purpose of weight reduction. Such heddle frames have, however, the disadvantage,. that they `require relatively much space in the fore and aft direction so that with they smallest` shaft pitch of about 10 mm. occurring in dobby looms the heddle frames arranged one behind the other cannot move freely. The hollow space of the these bars cannot be reduced below a certain dimension for the reason that the vertical side supports and tenons, respectively, or any other connecting means or pieces, which might be used, inserted axially into the hollow sections cannot be reduced below a certain thickness for reasons of strength. As experience has shown the fore and aft measurement of such heddle bars must be at least 8 mm. which always makes their use problematic as wear caused by rubbing of the staves often occurs.

The present invention eliminates these and other disadvantages and relates to a heddle frame for looms which can be manufactured with a small fore and aft 'space requirement. According to the invention the horizontal bars of the heddle frame are formed as solid metal staves double T-shaped in cross section having at least in the T-limb projecting towards the inside of the heddle frame one undercut longitudinal slot.

Other objects will be apparent from the detailed description of some embodiments of the present invention which will now be described by way of example with reference to the acco1n panying drawing in which:

Fig. 1 is a vertical cross section through one of the bars of a heddle frame according to a nrst embodiment of the invention,

Fig. 2 is a front view of a part of the heddle frame, partly in section,

Fig. 3 a vertical cross through the shaft of a heddle frame according to a second embodiment of the invention,

Fig. 4 shows an alternative to Fig. 3, and

Fig. 5 is a vertical cross section through the shaft of a third embodiment of the invention.

The heddle frame has two similar shafts i arranged horizontally and symmetrically to each other, said shafts consisting of solid, sectioned metal bars or staves, preferably made of light metal. According to Fig. 1 which shows a cross section through the top shaft, the cross section thereof has the shape of an upright double T 2. with short T-limbs in which an undercut longitudinal slot 2 on the outside of the heddle frame and a similar slot 3 on the inside of the heddlefrarne are provided. One of the T-limbs z. of a further double T section t of smaller cross section is inserted in the longitudinal slot 3 in such a manner that the edges of said undercut slot 3 partly embrace the section i securely. As show in 2 the heddle frame is shaped' in such a manner that the small T-sectioned rail i of the top shaft l projects downwardly and that of the bottom shaft l upwardly. Both shafts are joined to each other by means of vertical side supports 5 of hollow section under interposition of suitable .angular piece connections 8 in the corners of the shaft, said angular pieces projecting on one side into the side supports 5 by means of suitable tenons 'l and having the forked parts 8 embracing the vertical web la. of the double-T-shaped shafts I on either side.

The double-T-shaped rails l?. of smaller section preferably made of steel may serve directly as heald suspension rails if the heaids are provided with correspondingly claw-shaped carriers at their ends. On the other hand suitable riders can rst of all be slid on to the permanently iixed rails said riders in turn carrying the heald suspension. rails or Wires.

For reinforcing the shafts the webs of the double-T-shaped shafts i can be corrugated twice as regards their cross section according tc Fig. 3 or several times according to Fig. 4. Furthermore there is also the possibility for the same reason of off-setting the web as regards its cross section alternately to one side and then to the other of the longitudinal center line passing through the center oi the ends oi shaft i as may be realized. from Fig. 5.

The undercut longitudinal slots provided at the top and the bottom outer ends of the shafts may also serve for the securing of the suspension and holding down hooks respectively, said hooks being slid into the slots by means ci a correspond ingly shaped part provided thereon. In the form shown the heddle trarne is mainly suitable for use in looms having a superstructure.

When using these heddle frames on looms havn ing lateral dobbies, corresponding securing means must be provided on the side supports ii in which case the outer slots 2 remain unused or can be left out altogether.

Due to the use of solid, sectioned shafts the heddle frame described can be produced with smaller overall dimensions in the fore and aft direction than is the case with hollow shafts so that the former can with advantage be used in connection with dobby looms having smaller shaft pitches. Whereas up to now it was recommended with the hollow shafts to provide the front and rear surfaces rubbing against each other or at least one thereof with a non-metallic frictional protection layer; this relatively expensive measure is no longer necessary with the heddle frame described since the rubbing action can be reduced to a minimum due first of all to the smaller fore and aft dimensions of the shafts and secondly because of the reduced surfaces sliding on each other.

Without decreasing the strength and rigidity of the heddle frame the height of the shafts can be reduced when using the solid, double-T-section as compared to that of the hollow shafts.

The production of the heddle frame described is from the economical standpoint more favorable than Was the case heretofore, and the present heddle frame is well adapted and particularly suitable for looms with superstructures and due to its light weight in particular so for the older types of looms the shaft motion elements of which--as is well-known-a-re of relatively Weak construction.

What I claim and wish to secure by Letters Patent is:

In a heddle frame for looms; a self-supporting bar of solid material with double T-shaped ends in cross section forming a unitary web with opposite ends, said web including at least two offset portions positioned in staggered relation to each other on the central portion of said web and at opposite sides of the latter, the longitudinal axis taken along the cross section of said web passing through the middle of said opposite ends and continuously through the material of said web, at least one of said ends being provided with a slot shaped to receive and embrace a portion of a rail for securing the latter to said bar.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 634,692 Lanz Oct. l0, 1899 1,434,189 Bennett Oct. 3l, 1922 1,866,908 Robertson July 12, 1932 2,216,682 Zurcher et al. Oct. 1, 1940 2,461,496 Kaufmann Feb. 8, 1949 FOREIGN PATENTS Number Country Date 101,736 Sweden June 3, 1941 211,902. Switzerland Oct. 31, 1940 405,551 Great Britain Feb. 8, 1934 

